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