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