main riff that plays through the verses: 

E|-8---8---8--7--7--7-5--5--5-5--5--5-) 
B|--10--10--10-9--9--9-5--5--5-5--5--5) 
G|----9---9-----9--9----5--5----5--5--) 
D|------------------------------------) 
A|------------------------------------) 
E|------------------------------------) 

0:00 main riff once 
0:06 main riff twice then proceed to riff 2: 


0:18 
E|-10----10----10--10----10----10--8---8---8--8---8---8---| 
B|---10----10----10--10----10----10-10--10--10-10--10--10-| 
G|-----10----10--------10----10-------9---9------9---9----| 
D|--------------------------------------------------------| 
A|--------------------------------------------------------| 
E|--------------------------------------------------------| 

0:24 main riff 

0:30 this little bit kicks in, along with main riff playing 

E|--------------------------------------) 
B|--------------------------------------) 
G|-those-are-twelves--------------------) 
D|--------------------------------------) 
A|--------------------------------------) 
E|-5--5-55-12--12-1212-5--5--55-5--55555) 

0:54 bit changes to this 

E|-----------------------------------------------------------------------------| 
B|-----------------------------------------------------------------------------| 
G|-----------------------------------------------------------------------------| 
D|-----------------------------------------------------------------------------| 
A|-----------------------------------------------------------------------------| 
E|-10--10-1010-10--10-1010-5--5-55-5--5-55-5--5-55-12--12-1212-5--5-55-5--5-55-| 

by listening to the rest of the song, you can pinpoint where each riff happens. there  
may be some variations but they are very easy to figure out. 
Hope this helps!