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