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