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