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