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