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