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