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