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