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