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