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