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!