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