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