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