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