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