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