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