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