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