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