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