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