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