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