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