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