The Cure played this song at the concert I went to this April, but to my disappointment,
didn't use an actual sitar for the part that was in the original recording; he just
a regular guitar (with a soundboard, obviously, but you get my point). So I took like my 
Robert and "transposed" the sitar part into a guitar part for your enjoyment. OH and
note that I have not included the extra/in-between notes played by the guitar in the 
this is strictly the sitar part.

*Tune the E string down to a C*
The phrases below are repeated (as a whole) throughout the entire song:
e|------------------------------2-3-----------------|
B|--------------------------3-4-----4-3-------------|
G|------------------------5-------------5-----------|   x4
D|--------------------------------------------------|
A|--0-----------------------------------------------|
C|----------8------7--0-----------------------------|

e|--1-----1-1h3--4-3-1------------------------------|
B|--------------------------------------------------|
G|--------------------------------------------------| x2
D|--------------------------------------------------|
A|--------------------------------------------------|
C|--------------------------------------------------|

e|--3-1--------------3-1----------------------------|
B|------4-3-1-3-4--------4-3-1-3-4------------------|
G|----------------3----------------3---0------------| x2
D|--------------------------------------------------|
A|---------------------------------------3----------|
C|---------------------------------------0----------|

The last part is similar to the beginning, but you end on the 2nd fret of e:

e|------------------------------2-------------------|
B|--------------------------3-4---------------------|
G|------------------------5-------------------------|
D|--------------------------------------------------|
A|--0-----------------------------------------------|
C|----------8------7--0-----------------------------|

The last 2 notes are harmonics from the guitar in the background.