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