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