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)(11,16)(12,13)(14,15)(17,18)(19,24)(20,26)(21,29)(22,23)(25,30)(27,28)(31,32)(1,3,5,8)(2,6,7,4)(9,11,14,13)(10,12,15,16)(18,23)(19,26)(25,29)(27,32)(1,3)(2,6)(4,7)(5,8)(9,12)(10,13)(11,15)(14,16)(18,23)(19,26)(21,30)(28,31) involution — undirected(2,7)(3,8)(9,12,14,16)(10,13,15,11)(17,19,22,26)(18,24,23,20)(21,27,30,32)(25,31,29,28)(1,3)(2,4)(5,8)(6,7)(9,12)(10,11)(13,15)(14,16)(17,20,22,24)(18,19,23,26)(21,28,30,31)(25,27,29,32)(1,4)(2,3)(5,6)(7,8)(9,13,14,11)(10,12,15,16)(17,21,22,30)(18,25,23,29)(19,27,26,32)(20,28,24,31)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.