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