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