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