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