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