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