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