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