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