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