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)(19,24)(20,25)(21,26)(22,23)(27,31)(28,29)(30,32) involution — undirected(2,6)(7,9)(8,12)(14,15)(17,19)(18,24)(20,27)(21,23)(22,26)(25,31)(28,32)(29,30)(33,34,38,39)(35,36,40,43)(37,41,45,46)(42,44,47,48)(2,6)(4,13)(7,9)(10,16)(18,22)(19,21)(25,28)(27,30)(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)(17,20,23,29)(18,25,22,28)(19,27,21,30)(24,31,26,32)(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)(17,21,23,19)(18,26,22,24)(20,27,29,30)(25,31,28,32)(33,36)(34,40)(35,39)(37,44)(38,43)(41,47)(42,46)(45,48)(1,4,5,13)(2,8,6,12)(3,10,11,16)(7,14,9,15)(17,22,23,18)(19,26,21,24)(20,28,29,25)(27,32,30,31)(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.