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