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