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