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