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