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