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