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