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