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