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)(27,30)(28,31)(29,32)(33,40)(34,38)(35,37)(36,39)(1,3,4,8)(2,5,6,7)(25,27,29,34)(26,30,32,38)(28,35,36,33)(31,37,39,40)(9,11,12,19,14,21,13,20)(10,15,22,24,17,23,16,18)(25,28,29,36)(26,31,32,39)(27,33)(30,37)(34,35)(38,40)(2,6)(5,7)(9,12,14,13)(10,16,17,22)(11,19,21,20)(15,18,23,24)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.