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