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