This is how Kelly plays it live.
I'm not sure of Adam's parts, but they're mainly just doubling Kelly's chords during the 
and strumming the chords in the verses and letting them ring.  Easy stuff.

Three chords in the whole song:

e|--------------------|
B|--------------------|
G|--------------------|
D|-14--11--7----------|
A|-14--11--7----------|
E|-12--9---5----------|
   E5C#5  A5 (x022xx@1)The rhythm of the guitar part is similar to another Stereophonics song's guitar part, "Rewind".

Intro:
E5 C#5

Verse 1:
E5 (022xxx@1)                  C#5You (x133xx@4)fly, with angels' wings
        E5 (022xxx@1)              C#5You (x133xx@4)got my, blood in your veins
         A5 (x022xx@1)           E5And (022xxx@1)your eyes, see everything
         A5 (x022xx@1)                E5And (022xxx@1)they shine, like diamond rings


Chorus:
          C#5You're (x133xx@4)my Sunday
            A5 (x022xx@1)          E5You (022xxx@1)make my Monday, come alive
          C#5 (x133xx@4)             A5Just (x022xx@1)like Tuesday, you're a new day,
              E5That (022xxx@1)wakes me up
           C#5Wednesday's (x133xx@4)raining
           A5Thursday's (x022xx@1)yearning,
           E5For (022xxx@1)Friday nights
        C#5 (x133xx@4)               A5 (x022xx@1)           E5Then (022xxx@1)it all ends at the weekend, you're my star


Verse 2:
E5 (022xxx@1)                   C#5At (x133xx@4)times, I cave right in
         E5 (022xxx@1)            C#5But (x133xx@4)this fight we have to win
         A5 (x022xx@1)              E5And (022xxx@1)your songs you love to sing
          A5 (x022xx@1)            E5May (022xxx@1)your dreams, forever live


Chorus:
         C#5You're (x133xx@4)my Sunday
            A5 (x022xx@1)          E5You (022xxx@1)make my Monday, come alive
          C#5 (x133xx@4)             A5Just (x022xx@1)like Tuesday, you're a new day,
              E5That (022xxx@1)wakes me up
           C#5Wednesday's (x133xx@4)raining
           A5Thursday's (x022xx@1)yearning,
           E5For (022xxx@1)Friday nights
        C#5 (x133xx@4)               A5 (x022xx@1)           E5Then (022xxx@1)it all ends at the weekend, you're my star


Bridge:
       E5You're (022xxx@1)my star
    C#5Yes (x133xx@4)you are
       A5It's (x022xx@1)a thrill to see your imagination
     E5Just (022xxx@1)watching you is an education
       A5What's (x022xx@1)in your mind is my fascination
   E5It (022xxx@1)blows my mind and sets my heart racing


Chorus:
       C#5You're (x133xx@4)my Sunday
            A5 (x022xx@1)          E5You (022xxx@1)make my Monday, come alive
          C#5 (x133xx@4)             A5Just (x022xx@1)like Tuesday, you're a new day,
              E5That (022xxx@1)wakes me up
           C#5Wednesday's (x133xx@4)raining
           A5Thursday's (x022xx@1)yearning,
           E5For (022xxx@1)Friday nights
        C#5 (x133xx@4)               A5 (x022xx@1)           E5Then (022xxx@1)it all ends at the weekend, you're my star

C#5  A5  E5