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