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