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