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