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