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