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)(27,33)(28,35)(29,37)(30,31)(32,38)(34,36)(39,40)(3,7)(6,8)(9,11,15,14)(10,16,13,12)(17,18,21,20)(19,23,24,22)(26,31)(28,33)(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)(26,28,31,33)(29,34,38,40)(32,36,37,39)(1,3)(2,6)(4,7)(5,8)(9,13,15,10)(11,16,14,12)(25,28)(26,27)(29,36)(30,33)(31,35)(32,34)(37,40)(38,39)(1,2)(3,6)(4,5)(7,8)(9,14,15,11)(10,16,13,12)(17,20,21,18)(19,23,24,22)(25,29,30,38)(26,32,31,37)(27,34,35,40)(28,36,33,39)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.