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