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