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) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(17,18)(19,24)(20,29)(21,23)(22,27)(25,30)(26,31)(28,32)(10,15)(14,16)(18,23)(21,31)(24,32)(25,29)(26,27)(28,30) involution — undirected(2,6)(5,7)(17,19,22,20)(18,24,27,29)(21,28,31,30)(23,32,26,25)(3,8)(5,7)(9,12,13,11)(10,16,15,14)(17,20,22,19)(18,25,27,32)(21,28,31,30)(23,29,26,24)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.