Riff 1
G------------------------------------------
D------------------------------------------
A--1111-4444-------1111--------------------
E------------1111--------------------------
 
Do That 'till drum roll then:

Riff 2
G-----------------------------------------
D-----------------------------------------
A-----------------------------------------
E--1-111111-3--333333---------------------



So from the top:
Guitar intro then a drum roll then Riff 1
Riff2
riff 1
riff 2
Drum solo (play riff 1 after two measures of drum solo)
Riff 2
Riff 1