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