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