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