Q    E  Q    S E  S E
G||---------------0-2--0--------|  x2
D||--0----3--------------3------|
A||-----------------------------|
D||-----------------------------|
  Q    E  Q    S E  S E
-------0-------2-3--2-0--|  x2
--1----------------------|
-------------------------|
-------------------------|

That is the main riff, whitch is repeated many times. Theres a drop D alternative to it 
but it's kinda low..

  Q    E  Q    S E  S E
-------------------------|  x2
-------------------------|
-----------------0-------|
--0----3-------5----5-3--|

  Q    E  Q    S E  S E
-------------------------|  x2
-------------------------|
---------------0-1--0----|
--1----5--------------5--|

Then..

  Wx2
-------------------|
--0----------------|
-------------------|
-------------------|


  Wx2
-------------------|
--1----------------|
-------------------|
-------------------|

Then another much used riff, listen to the rythm:

  S S S S S S S S S S S Q    S
-------------------------------|  x2
--0-0---0-0---0-0---0-0--------|
-------------------------------|
-------------------------------|

  S S S S S S S S S S S Q    S
-------------------------------|  x2
--1-1---1-1---1-1---1-1--------|
-------------------------------|
-------------------------------|

There might be a little palm mut in that riff.

The end:

  S S S S S S S S S S S Q    S
-------------------------------|  x2
--0-0---0-0-----0-----0--------|
--------------3-----3----------|
-------------------------------|

  S S S S S S S S S S S Q    S
-------------------------------|  x2
--1-1---1-1-----1-----1--------|
--------------3-----3----------|    I'm not sure abot the threes here, though
-------------------------------|

Only the first part of this riff is played in the end, with something extra at about 3:22:

  S S S S S S S S S S S Q    S
-------------------------------|  x2
-------------------------------|
--3-3---3-3---3-3---3-3--------|
-------------------------------|