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