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