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