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