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