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