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