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