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