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