Had to play this for my college course and i couldn't find any tabs myself for a muddy 
waters version so figured i'd put up what i play for this song.

Part 1

G|-----------------------------------|
D|-----------------------------------|
A|-----------------------------------| (I played muted notes to keep time
E|--0-3~-3-5--XX--XX-----------------|  in the gaps)

G|----------5~-5-4--------------5~-5-4-----|
D|-----4~-7--------7-4-----4~-7--------7-4-|
A|-5-5-----------------5-5-----------------|
E|-----------------------------------------|

Part 2

G|-----------------------------------------|
D|----------5~-5-4-----77-55-44-33---------| (I like to slide from the 3 into
A|-----4~-7--------7-4---------------------|  the next part)
E|-5-5-------------------------------------|

G|----------7~-5-6--------------5~-5-4---------------------------|
D|-----6~-9--------9-6-----4~-7--------7-4-77-55-44-33-2-R-0-1h2-|
A|-7-7-----------------5-5---------------------------------------|
E|---------------------------------------------------------------|

  Play this part through once for the chorus section and go back to part 1

G|-----------------------------------|
D|-----------------------------------|
A|-----------------------------------| I do this to fill the gap between part
E|--5-/-12-12-12-12-12-12------------| 1 and 2 but it isn't needed

That's all the parts I play, just play along with the song, there are a few versions of 
the song so find one this fits with or just change it however you'd like.

A.G