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