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