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