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