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