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