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