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