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