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