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