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