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