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