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