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