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