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