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