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