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