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