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