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