One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18,20,24,32,39,45,43,22,26,34,41,21,25,33,40)(19,27,28,42,35,48,47,37,30,44,46,36,29,38,31,23)(1,3,4,8)(2,5,6,7)(9,10,12,13)(11,14,15,16)(10,13)(14,16)(17,19,22,30)(18,23,26,37)(20,31,34,47)(21,35,32,29)(24,38,41,48)(25,42,39,36)(27,43,44,40)(28,45,46,33)(2,6)(5,7)(9,11,12,15)(10,14,13,16)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.