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