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