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