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)(11,14)(12,15)(13,16) involution — undirected(2,5)(6,8)(9,11,13,12)(10,14,16,15)(17,18)(19,27)(20,25)(21,24)(22,26)(23,30)(28,31)(29,32)(9,11,13,12)(10,15,16,14)(17,19,22,28)(18,23,26,32)(20,30,21,29)(24,27,25,31)(9,12,13,11)(10,15,16,14)(18,24)(19,28)(20,21)(23,31)(25,26)(27,32)(1,3,4,7)(2,6,5,8)(17,20,22,21)(18,25,26,24)(19,29,28,30)(23,27,32,31)A 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.