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