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