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