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