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