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