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