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