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