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