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