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