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