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