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