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