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