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