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