One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,12,14)(11,16,15,13)(17,18)(19,28)(20,30)(21,27)(22,26)(23,25)(24,29)(31,32)(1,3,4,8)(2,5,6,7)(10,14)(13,16)(17,19,22,29)(18,24,26,28)(20,23,31,21)(25,30,27,32)(9,11,13,10,12,15,16,14)(17,20,23,29,22,31,21,19)(18,24,27,30,26,28,25,32)(2,6)(5,7)(10,14)(11,15)(17,21,22,23)(18,25,26,27)(19,20,29,31)(24,30,28,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.