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