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