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