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