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