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