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