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