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