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