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