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)(19,21)(20,25)(22,23)(24,27)(26,29)(28,30)(31,32) involution — undirected(1,2)(3,4)(5,6)(7,8)(9,10,13,16)(11,14,15,12)(18,23)(21,24)(25,30)(29,31)(2,6)(3,7)(9,10,13,16)(11,12,15,14)(20,28)(25,30)(26,32)(29,31)(9,11,13,15)(10,14,16,12)(17,19)(18,24)(20,26)(21,23)(22,27)(25,31)(28,32)(29,30)(1,3,5,7)(2,4,6,8)(9,10)(11,14)(12,15)(13,16)(17,20,22,28)(18,25,23,30)(19,26,27,32)(21,29,24,31)(1,4)(2,7)(3,6)(5,8)(9,12,13,14)(10,15,16,11)(17,21,22,24)(18,19,23,27)(20,29,28,31)(25,26,30,32)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.