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