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