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