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