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