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