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