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