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