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