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