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