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