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