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