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