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