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