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