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