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