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