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