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