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