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