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