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)(19,30)(20,26)(21,28)(22,37)(23,39)(24,29)(25,33)(27,36)(31,47)(32,43)(34,45)(35,46)(38,41)(40,42)(44,48) involution — undirected(1,3)(2,6)(4,9)(5,10)(7,12)(8,13)(11,16)(14,15)(17,19)(18,25)(20,31)(21,33)(22,38)(23,40)(24,34)(26,41)(27,45)(28,42)(29,44)(30,37)(32,36)(35,48)(39,43)(46,47) involution — undirected(1,4)(2,7)(3,9)(5,11)(6,12)(8,14)(10,16)(13,15)(17,20,24,23)(18,26,29,39)(19,31,34,40)(21,22,35,36)(25,41,44,43)(27,28,37,46)(30,47,45,42)(32,33,38,48)(2,8)(6,13)(7,14)(12,15)(17,21,23,36,24,35,20,22)(18,27,26,28,29,37,39,46)(19,32,31,33,34,38,40,48)(25,42,43,45,44,47,41,30)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.