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