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