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