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