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