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