Here is what I play for the riffs through out the song :

Riff 1 

|-----3-------3-------3-------3-----------------------------|
|-1-1-----1-1-----1-1-----1-1-------------------------------|
|-----------------------------------------------------------|
|-----------------------------------------------------------|
|-----------------------------------------------------------| 
|-----------------------------------------------------------| 

Riff 2 

|-----------------------------------------------------------|
|----5-5-5-5--------6-6-6-6-5-------------------------------|
|------------5-5--------------------------------------------|
|-----------------------------------------------------------|
|-----------------------------------------------------------| 
|-----------------------------------------------------------|