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