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