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