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