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