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