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