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