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