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