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