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