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