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