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