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