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