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