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