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