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