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