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