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