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)(19,23)(20,24)(21,26)(22,25)(27,36)(28,37)(29,38)(30,39)(31,41)(32,40)(33,43)(34,44)(35,42)(45,47)(46,48) involution — undirected(2,5)(6,8)(17,19,22,29)(18,23,25,38)(20,30,32,45)(21,33,35,28)(24,39,40,47)(26,43,42,37)(27,34,46,31)(36,44,48,41)(10,13)(14,16)(17,20,22,32)(18,24,25,40)(19,27,29,46)(21,34,35,31)(23,36,38,48)(26,44,42,41)(28,45,33,30)(37,47,43,39)(9,11,12,15)(10,14,13,16)(19,28)(21,35)(23,37)(26,42)(27,45)(29,33)(30,46)(31,34)(36,47)(38,43)(39,48)(41,44)(1,3,4,7)(2,6,5,8)(18,25)(19,29)(24,40)(26,42)(27,46)(28,33)(30,45)(41,44)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.