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