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