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