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