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