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