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