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