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