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