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