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