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