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