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