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