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)(11,12)(13,21)(14,15)(16,20)(17,22)(18,24)(19,23)(25,26,31,34)(27,35,38,32)(28,39,37,29)(30,40,36,33)(1,3)(2,5)(4,8)(6,7)(9,11,14,16)(10,12,15,20)(13,18,22,23)(17,19,21,24)(25,27)(26,32)(28,36)(29,33)(30,37)(31,38)(34,35)(39,40)(1,3)(2,5)(4,8)(6,7)(10,15)(11,16)(17,21)(18,23)(25,26,31,34)(27,32,38,35)(28,39,37,29)(30,33,36,40)(1,3,4,8)(2,5,6,7)(9,11)(10,12)(13,18)(14,16)(15,20)(17,19)(21,24)(22,23)(25,28,31,37)(26,29,34,39)(27,36,38,30)(32,33,35,40)(1,3)(2,5)(4,8)(6,7)(9,12)(10,16)(11,15)(13,19)(14,20)(17,23)(18,21)(22,24)(25,29)(26,28)(27,33)(30,35)(31,39)(32,36)(34,37)(38,40) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,13,14,22)(10,17,15,21)(11,18,16,23)(12,19,20,24)(25,30,31,36)(26,33,34,40)(27,37,38,28)(29,35,39,32)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.