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