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