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