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