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