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