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