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