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