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