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