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