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