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)(11,17)(12,20)(13,15)(14,19)(16,21)(18,24)(22,23)(28,36)(30,39)(32,37)(35,38)(1,3,4,8)(2,5,6,7)(12,21)(14,23)(16,20)(19,22)(25,26)(27,33)(28,37)(29,31)(30,35)(32,36)(34,40)(38,39)(9,11,13,18)(10,14,15,23)(12,22,21,19)(16,24,20,17)(25,27)(26,30)(28,38)(29,34)(31,39)(32,40)(33,37)(35,36)(10,15)(11,18)(16,20)(19,22)(27,34)(30,39)(33,40)(35,38) 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.