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)(17,18,22,24)(19,21,26,23)(20,25,28,32)(27,31,29,30)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(18,24)(19,26)(20,28)(30,31) involution — undirected(10,14)(11,15)(17,19,23,18,22,26,21,24)(20,29,30,32,28,27,31,25)(11,15)(13,16)(17,20)(18,25)(19,27)(21,31)(22,28)(23,30)(24,32)(26,29) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,22,23)(18,26,24,19)(20,30,28,31)(25,27,32,29)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.