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