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