One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,12,14)(11,15,16,13)(17,18,21,25)(19,27,28,23)(20,30,29,24)(22,26,31,32)(2,6)(7,8)(11,16)(13,15)(17,19,21,28)(18,23,25,27)(20,31,29,22)(24,32,30,26)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,18)(19,27)(20,30)(21,25)(22,26)(23,28)(24,29)(31,32)(10,14)(13,15)(17,20,22,19,21,29,31,28)(18,24,26,23,25,30,32,27)(1,4,5,3)(2,7,6,8)(18,25)(23,27)(24,30)(26,32)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.