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