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