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