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