One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,14)(12,13)(15,16)(18,22)(23,30)(24,29)(28,31) involution — undirected(2,5)(6,7)(18,23)(20,27)(21,26)(22,30)(24,31)(25,32)(28,29) involution — undirected(1,3,4,8)(2,6,5,7)(10,13)(14,16)(17,18)(19,22)(20,28)(21,29)(23,27)(24,26)(25,31)(30,32)(3,8)(6,7)(9,11,12,15)(10,14,13,16)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.