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