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)(20,22)(21,33)(25,37)(26,42)(27,38)(28,31)(29,43)(32,35)(34,36)(39,44)(40,47)(41,48)(45,46) involution — undirected(1,3,7,4)(2,8,9,16)(5,14,6,13)(10,15,11,12)(17,18,23,27)(19,25,30,41)(20,26,22,36)(21,34,35,42)(24,32,38,33)(28,39,31,40)(29,44,45,47)(37,46,48,43)(1,4,7,3)(2,8,9,16)(5,13,6,14)(10,15,11,12)(17,19)(18,25)(20,31)(21,29)(22,28)(23,30)(24,37)(26,40)(27,41)(32,46)(33,43)(34,44)(35,45)(36,39)(38,48)(42,47)(2,9)(8,16)(10,11)(12,15)(17,20,23,22)(18,26,27,36)(19,28,30,31)(21,32,35,33)(24,34,38,42)(25,39,41,40)(29,43,45,46)(37,47,48,44)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.