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