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