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