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