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