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