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