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