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