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