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