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