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