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