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