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