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