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