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