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