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