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