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