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