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