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