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