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