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