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)(25,26,29,34)(27,31,36,32)(28,33,37,40)(30,35,38,39)(9,11,13,19)(10,14,16,17)(12,18,21,24)(15,22,20,23)(25,27,29,36)(26,31,34,32)(28,30,37,38)(33,35,40,39)(2,6)(7,8)(25,27,30,28,29,36,38,37)(26,32,35,40,34,31,39,33)(1,3,5,4)(2,7,6,8)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(1,4,5,3)(2,8,6,7)(11,19)(14,17)(18,24)(22,23)(25,28,30,36,29,37,38,27)(26,33,35,32,34,40,39,31)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.