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