I've looked the new DVD from Simon and Garfunkel.
Paul Simon plays the song like this:
(contact: danielharms@t-online.de)

CHORUS:
 G (320003@1)              C (x32010@1)        GCecilia, (320003@1)you're breaking my heart
          C (x32010@1)       G (320003@1)       DYou're (xx0232@1)shaking my confidence daily
      CG        C (x32010@1)         G (320003@1)Oh Cecilia, I'm down on my knees
       C (x32010@1)        G (320003@1)           DI'm (xx0232@1)begging you please to come home
         GCome (320003@1)on home

CHORUS

 G (320003@1)                 C (x32010@1) GMaking (320003@1)love in the afternoon with Cecilia
 C (x32010@1)   D (xx0232@1)   GUp (320003@1)in my bedroom
             C (x32010@1)     GI (320003@1)got up to wash my face
              C (x32010@1)    GWhen (320003@1)I come back to bed
           D (xx0232@1)       GSomeone's (320003@1)taken my place 

CHORUS again

 C (x32010@1)      G (320003@1)   CG D (xx0232@1)Bo po bo bo ...

     C (x32010@1)G (320003@1)     C (x32010@1)        GJubilation, (320003@1)she loves me again
    C (x32010@1)         G (320003@1)           DI (xx0232@1)fall on the floor and I laughing
     C (x32010@1)G (320003@1)     C (x32010@1)        GJubilation, (320003@1)she loves me again
   C (x32010@1)          G (320003@1)           DI (xx0232@1)fall on the floor and I laughing

              CG CG CG DG
Wo ho oooh ...