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