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