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