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