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