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