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