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)(11,12,19,15)(13,21,23,16)(18,24,22,20)(28,36)(31,37)(34,40)(38,39)(2,6)(3,7)(9,10,14,17)(11,12,19,15)(13,16,23,21)(18,20,22,24)(25,26)(27,32)(28,37)(29,33)(30,35)(31,36)(34,38)(39,40)(1,3,5,7)(2,4,6,8)(9,11)(10,15)(12,17)(13,18)(14,19)(16,24)(20,21)(22,23)(25,27)(26,30)(28,34)(29,35)(31,38)(32,33)(36,40)(37,39)(1,4)(2,7)(3,6)(5,8)(9,12,14,15)(10,11,17,19)(13,20,23,24)(16,18,21,22)(25,28,29,36)(26,31,33,37)(27,34,35,40)(30,38,32,39)(9,11)(10,12)(13,22)(14,19)(15,17)(16,24)(18,23)(20,21)(25,27)(26,32)(28,34)(29,35)(30,33)(31,39)(36,40)(37,38) involution — undirected(9,13)(10,16)(11,18)(12,20)(14,23)(15,24)(17,21)(19,22)(25,26)(27,30)(28,31)(29,33)(32,35)(34,38)(36,37)(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.