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