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