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