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