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