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