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