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