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