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