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