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