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