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