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