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