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