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