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)(11,12)(13,14)(15,16)(17,18)(19,23)(20,21)(22,24)(26,30)(31,32)(2,4)(6,8)(10,14)(12,16)(18,21)(22,23)(26,30)(31,32) involution — undirected(3,7)(6,8)(10,14)(11,15)(17,19,20,24)(18,22,21,23)(25,26)(27,31)(28,32)(29,30)(1,3,5,7)(2,6,4,8)(9,11)(10,12)(13,15)(14,16)(17,19)(18,22)(20,24)(21,23)(25,27,29,28)(26,31,30,32)(1,4,5,2)(3,8,7,6)(9,12)(10,11)(13,16)(14,15)(17,18)(19,22)(20,21)(23,24)(25,28,29,27)(26,32,30,31)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.