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