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