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