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