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