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