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