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