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