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