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