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