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