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)(25,26,30,34)(27,28,32,31)(29,33,39,40)(35,36,37,38)(1,2,5,6)(3,7,4,8)(9,10)(11,15)(12,20)(13,14)(16,22)(17,18)(19,24)(21,23)(25,27,30,32)(26,31,34,28)(29,37,39,35)(33,36,40,38)(1,3,5,4)(2,7,6,8)(10,14)(11,18)(16,20)(19,21)(27,32)(28,31)(35,37)(36,38)(9,10)(11,15)(12,16)(13,14)(17,18)(19,23)(20,22)(21,24)(25,26)(27,31)(28,32)(29,33)(30,34)(35,38)(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)(25,28,30,31)(26,32,34,27)(29,38,39,36)(33,35,40,37)(1,4,5,3)(2,8,6,7)(9,12,13,22)(10,16,14,20)(11,19,18,21)(15,23,17,24)(25,29,30,39)(26,33,34,40)(27,35,32,37)(28,36,31,38)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.