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