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