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