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