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