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