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