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