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