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