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