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