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