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