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