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