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