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