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