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