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