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