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