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