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