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