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