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