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