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