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