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