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