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