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