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