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