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