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