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