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