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