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