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