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