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