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