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