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