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