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