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