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