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