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