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