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