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)(12,15,19,17)(13,18,21,16)(20,23,24,22)(25,26,31,32)(27,30,28,35)(29,33,37,40)(34,39,36,38)(2,6)(3,7)(12,19)(15,17)(20,24)(22,23)(25,27)(26,30)(28,31)(29,36)(32,35)(33,38)(34,37)(39,40) involution — undirected(1,3,5,7)(2,4,6,8)(10,11)(15,17)(16,18)(22,23)(26,32)(27,28)(29,37)(38,39)(1,4)(2,7)(3,6)(5,8)(9,11,14,10)(12,17,19,15)(13,18,21,16)(20,23,24,22)(25,28,31,27)(26,30,32,35)(29,36,37,34)(33,39,40,38)(9,12)(10,15)(11,17)(13,20)(14,19)(16,22)(18,23)(21,24)(25,29)(26,33)(27,34)(28,36)(30,39)(31,37)(32,40)(35,38) involution — undirected(9,13)(10,16)(11,18)(12,20)(14,21)(15,22)(17,23)(19,24)(25,30)(26,27)(28,32)(29,38)(31,35)(33,36)(34,40)(37,39) 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.