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