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