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