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