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)(11,14)(12,21)(13,17)(15,18)(16,20)(19,24)(22,23)(26,28)(27,34)(30,38)(37,39) involution — undirected(2,6)(3,7)(9,11)(10,14)(12,13)(15,19)(16,22)(17,21)(18,24)(20,23)(25,26,31,28)(27,29,34,32)(30,33,38,36)(35,37,40,39)(1,3,5,7)(2,4,6,8)(11,19)(12,20)(14,24)(16,21)(25,27,31,34)(26,32,28,29)(30,35,38,40)(33,39,36,37)(1,4)(2,7)(3,6)(5,8)(9,12)(10,16)(11,13)(14,22)(15,20)(17,24)(18,21)(19,23)(25,28,31,26)(27,29,34,32)(30,36,38,33)(35,37,40,39)(9,13)(10,17)(11,20)(12,19)(14,16)(15,23)(18,22)(21,24)(25,29)(26,27)(28,34)(30,37)(31,32)(33,35)(36,40)(38,39) involution — undirected(9,14)(10,11)(12,22)(13,16)(15,24)(17,20)(18,19)(21,23)(25,30)(26,33)(27,35)(28,36)(29,37)(31,38)(32,39)(34,40) 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.