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