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