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