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