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