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