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