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