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