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