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