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