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