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