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