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