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)(11,15)(12,16)(13,14)(17,19)(18,22)(20,21)(23,24)(25,26)(27,33)(28,29)(30,32)(31,37)(34,39)(35,40)(36,38) involution — undirected(2,5)(6,7)(10,14)(15,17)(16,21)(22,23)(25,27)(26,31)(28,35)(29,36)(30,37)(32,33)(34,38)(39,40) involution — undirected(1,2)(3,6)(4,5)(7,8)(12,20)(16,21)(18,24)(22,23)(26,32)(29,39)(31,33)(36,40) involution — undirected(1,3)(2,6)(4,8)(5,7)(9,11)(10,15)(12,18)(13,19)(14,17)(16,22)(20,24)(21,23)(25,28,30,34)(26,29,32,39)(27,35,37,38)(31,36,33,40)(9,10)(11,17)(12,16)(13,14)(15,19)(18,23)(20,21)(22,24)(25,27)(26,33)(28,38)(29,36)(30,37)(31,32)(34,35)(39,40) involution — undirected(9,12)(10,16)(11,18)(13,20)(14,21)(15,22)(17,23)(19,24)(25,29)(26,34)(27,36)(28,32)(30,39)(31,38)(33,35)(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.