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