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