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