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