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