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