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