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