One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,5)(3,7,8,6)(9,10,13,18,15,20,14,19)(11,16,22,17,12,23,21,24)(25,26,28,33,29,32,35,31)(27,34,38,40,36,30,37,39)(2,5)(6,7)(9,11,13,22,15,12,14,21)(10,16,18,17,20,23,19,24)(25,27,35,37,29,36,28,38)(26,30,31,40,32,34,33,39)(9,12,15,11)(10,17,20,24)(13,22,14,21)(16,19,23,18)(26,31)(27,36)(28,35)(30,39)(32,33)(34,40)(1,3,4,8)(2,6,5,7)(9,13,15,14)(10,18,20,19)(11,21,12,22)(16,24,23,17)(25,28,29,35)(26,31,32,33)(27,37,36,38)(30,39,34,40)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.