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