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