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