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