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