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)(20,27)(23,28)(24,29)(25,31)(30,32) involution — undirected(1,2)(3,4)(17,18,20,22,21,24,27,29)(19,23,25,28,26,30,31,32)(2,4)(10,13)(14,16)(17,19,21,26)(18,23,24,30)(20,25,27,31)(22,28,29,32)(6,8)(9,11,12,15)(10,14,13,16)(18,22)(20,27)(23,28)(24,29)(25,31)(30,32)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.