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