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