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