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)(11,16)(12,18)(13,22)(14,19)(15,17)(20,23)(21,24)(25,26)(27,33)(28,31)(29,32)(30,35)(34,39)(36,38)(37,40)(1,3,5,8)(2,6,4,7)(9,11,15,20)(10,16,17,23)(12,19,22,24)(13,21,18,14)(25,27)(26,30)(28,34)(29,35)(31,37)(32,33)(36,40)(38,39)(10,17)(11,20)(12,22)(14,21)(25,26,29,32)(27,30,35,33)(28,31,36,38)(34,37,40,39)(1,2,5,4)(3,6,8,7)(9,12,15,22)(10,18,17,13)(11,19,20,24)(14,23,21,16)(25,26)(27,30)(28,31)(29,32)(33,35)(34,37)(36,38)(39,40)(1,2,5,4)(3,6,8,7)(9,13,15,18)(10,12,17,22)(11,21,20,14)(16,19,23,24)(25,27)(26,30)(28,34)(29,35)(31,37)(32,33)(36,40)(38,39)(1,4,5,2)(3,7,8,6)(9,14,15,21)(10,19,17,24)(11,18,20,13)(12,23,22,16)(25,28,29,36)(26,31,32,38)(27,34,35,40)(30,37,33,39)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.