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