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