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