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