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