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)(11,13)(12,14)(15,16)(20,27)(24,31)(26,29)(28,32) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,18,22,25)(19,23,21,30)(20,28,27,32)(24,26,31,29)(1,3,4,7)(2,6,5,8)(10,14)(11,15)(17,19,22,21)(18,23,25,30)(20,29,27,26)(24,32,31,28)(10,14)(13,16)(17,20,19,26,22,27,21,29)(18,24,30,32,25,31,23,28)(2,5)(6,8)(20,27)(24,31)(26,29)(28,32) 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.