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