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