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