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