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