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