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