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