One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(11,15)(14,16)(17,18)(19,28)(20,24)(21,27)(22,26)(23,31)(25,30)(29,32) involution — undirected(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19)(18,24)(20,22)(21,30)(23,29)(25,31)(26,28)(27,32) involution — undirected(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,20,22,19)(18,25,26,32)(21,30,23,29)(24,27,28,31)(9,11,12,15)(10,14,13,16)(18,26)(24,28)(25,32)(27,31)(17,21,22,23)(18,27,26,31)(19,29,20,30)(24,25,28,32)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.