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