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