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