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