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