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