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