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