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