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