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