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