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