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