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