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