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