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