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