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