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