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