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