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