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