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