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