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