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