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