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