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