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