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