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