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