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