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