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