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