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