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)(11,19)(12,17)(13,20)(14,15)(16,21)(18,23)(22,24)(25,26,31,35)(27,32,29,34)(28,38,30,33)(36,40,37,39)(1,3,6,5)(2,7,4,8)(10,15)(12,22)(16,19)(18,20)(25,27,31,29)(26,32,35,34)(28,37,30,36)(33,40,38,39)(9,11,14,21)(10,16,15,19)(12,20,22,18)(13,17,23,24)(25,28,31,30)(26,33,35,38)(27,36,29,37)(32,39,34,40)(2,4)(7,8)(9,11)(10,16)(12,18)(13,17)(14,21)(15,19)(20,22)(23,24)(25,29,31,27)(26,34,35,32)(28,36,30,37)(33,39,38,40)(1,4,6,2)(3,8,5,7)(9,12,14,22)(10,17,15,24)(11,20,21,18)(13,16,23,19)(25,30,31,28)(26,33,35,38)(27,37,29,36)(32,39,34,40)(1,5,6,3)(2,7,4,8)(9,13,14,23)(10,18,15,20)(11,17,21,24)(12,19,22,16)(25,26)(27,32)(28,33)(29,34)(30,38)(31,35)(36,39)(37,40)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.