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