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