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