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