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