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