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