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