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