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