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)(19,28)(20,25)(21,24)(22,26)(23,27)(29,31)(30,32)(1,3,5,4)(2,6,7,8)(17,18)(19,29)(20,27)(21,32)(22,26)(23,25)(24,30)(28,31)(9,11,12,16)(10,13,14,15)(17,19,22,21)(18,24,26,28)(20,30,23,31)(25,29,27,32)(1,4,5,3)(2,6,7,8)(17,20)(18,25)(19,21)(22,23)(24,28)(26,27)(17,21,22,19)(18,24,26,28)(20,31,23,30)(25,29,27,32)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.