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