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