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