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