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