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