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)(17,18,23,26)(19,29,31,41)(20,34,36,43)(21,28,22,27)(24,33,40,32)(25,37,44,38)(30,42,35,39)(45,46,48,47)(2,5)(6,8)(9,10)(11,16)(12,15)(13,14)(17,19)(18,24)(20,35)(21,33)(22,32)(23,31)(25,42)(26,40)(27,41)(28,29)(30,36)(34,45)(37,46)(38,47)(39,44)(43,48) involution — undirected(10,14)(15,16)(17,20,23,36)(18,25,26,44)(19,30,31,35)(21,38,22,37)(24,39,40,42)(27,34,28,43)(29,45,41,48)(32,47,33,46)(9,11,13,12)(10,15,14,16)(19,31)(24,40)(29,41)(30,35)(32,33)(39,42)(45,48)(46,47)(1,3,4,7)(2,6,5,8)(9,12,13,11)(10,15,14,16)(18,26)(20,36)(24,40)(27,28)(29,41)(30,35)(37,38)(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.