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