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