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