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