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