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