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