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