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