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