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