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