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)(11,14)(12,15)(13,17)(16,20)(18,22)(19,23)(21,24)(25,26,29,34)(27,35,37,31)(28,33,30,39)(32,38,40,36)(2,5)(6,7)(9,11)(10,14)(12,19)(13,18)(15,23)(16,21)(17,22)(20,24)(25,27,30,36,29,37,28,38)(26,31,39,40,34,35,33,32)(10,15)(11,18)(12,20)(14,21)(16,17)(22,23)(25,27,29,37)(26,32,34,40)(28,36,30,38)(31,39,35,33)(1,3,4,8)(2,6,5,7)(11,18)(14,22)(19,24)(21,23)(25,28,29,30)(26,33,34,39)(27,36,37,38)(31,40,35,32)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.