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