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